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targets/TARGET_NORDIC/TARGET_NRF5/i2c_api.c@180:d79f997829d6, 2017-12-18 (annotated)

Committer:
Anythingconnected
Date:
Mon Dec 18 10:14:27 2017 +0000
Revision:
180:d79f997829d6
Parent:
176:447f873cad2f 
Getting byte by byte read to work

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 144:ef7eb2e8f9f7 1 /*
<> 160:d5399cc887bb 2 * Copyright (c) 2017 Nordic Semiconductor ASA
<> 144:ef7eb2e8f9f7 3 * All rights reserved.
<> 144:ef7eb2e8f9f7 4 *
<> 144:ef7eb2e8f9f7 5 * Redistribution and use in source and binary forms, with or without modification,
<> 144:ef7eb2e8f9f7 6 * are permitted provided that the following conditions are met:
<> 144:ef7eb2e8f9f7 7 *
<> 144:ef7eb2e8f9f7 8 * 1. Redistributions of source code must retain the above copyright notice, this list
<> 144:ef7eb2e8f9f7 9 * of conditions and the following disclaimer.
<> 144:ef7eb2e8f9f7 10 *
<> 144:ef7eb2e8f9f7 11 * 2. Redistributions in binary form, except as embedded into a Nordic Semiconductor ASA
<> 144:ef7eb2e8f9f7 12 * integrated circuit in a product or a software update for such product, must reproduce
<> 144:ef7eb2e8f9f7 13 * the above copyright notice, this list of conditions and the following disclaimer in
<> 144:ef7eb2e8f9f7 14 * the documentation and/or other materials provided with the distribution.
<> 144:ef7eb2e8f9f7 15 *
<> 144:ef7eb2e8f9f7 16 * 3. Neither the name of Nordic Semiconductor ASA nor the names of its contributors may be
<> 144:ef7eb2e8f9f7 17 * used to endorse or promote products derived from this software without specific prior
<> 144:ef7eb2e8f9f7 18 * written permission.
<> 144:ef7eb2e8f9f7 19 *
<> 144:ef7eb2e8f9f7 20 * 4. This software, with or without modification, must only be used with a
<> 144:ef7eb2e8f9f7 21 * Nordic Semiconductor ASA integrated circuit.
<> 144:ef7eb2e8f9f7 22 *
<> 144:ef7eb2e8f9f7 23 * 5. Any software provided in binary or object form under this license must not be reverse
<> 144:ef7eb2e8f9f7 24 * engineered, decompiled, modified and/or disassembled.
<> 144:ef7eb2e8f9f7 25 *
<> 144:ef7eb2e8f9f7 26 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
<> 144:ef7eb2e8f9f7 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
<> 144:ef7eb2e8f9f7 28 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
<> 144:ef7eb2e8f9f7 29 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
<> 144:ef7eb2e8f9f7 30 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
<> 144:ef7eb2e8f9f7 31 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
<> 144:ef7eb2e8f9f7 32 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
<> 144:ef7eb2e8f9f7 33 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
<> 144:ef7eb2e8f9f7 34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
<> 144:ef7eb2e8f9f7 35 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
<> 144:ef7eb2e8f9f7 36 *
<> 144:ef7eb2e8f9f7 37 */
<> 144:ef7eb2e8f9f7 38
<> 144:ef7eb2e8f9f7 39
<> 144:ef7eb2e8f9f7 40 #include "i2c_api.h"
<> 144:ef7eb2e8f9f7 41
<> 144:ef7eb2e8f9f7 42 #if DEVICE_I2C
<> 144:ef7eb2e8f9f7 43
<> 144:ef7eb2e8f9f7 44 #include "mbed_assert.h"
<> 144:ef7eb2e8f9f7 45 #include "mbed_error.h"
<> 160:d5399cc887bb 46 #include "nrf_twi.h"
<> 160:d5399cc887bb 47 #include "nrf_drv_common.h"
AnnaBridge 165:e614a9f1c9e2 48 #include "sdk_config.h"
<> 144:ef7eb2e8f9f7 49 #include "app_util_platform.h"
<> 160:d5399cc887bb 50 #include "nrf_gpio.h"
<> 160:d5399cc887bb 51 #include "nrf_delay.h"
<> 160:d5399cc887bb 52
AnnaBridge 176:447f873cad2f 53 #include "us_ticker_api.h"
AnnaBridge 176:447f873cad2f 54
AnnaBridge 176:447f873cad2f 55 // An arbitrary value used as the timeout in loops waiting for given event
AnnaBridge 176:447f873cad2f 56 // (e.g. STOPPED), needed to avoid infinite loops.
AnnaBridge 176:447f873cad2f 57 // This value might be defined externally.
AnnaBridge 176:447f873cad2f 58 #ifndef I2C_TIMEOUT_VALUE_US
AnnaBridge 176:447f873cad2f 59 #define I2C_TIMEOUT_VALUE_US 1000000
AnnaBridge 176:447f873cad2f 60 #endif
<> 144:ef7eb2e8f9f7 61
<> 144:ef7eb2e8f9f7 62 #if DEVICE_I2C_ASYNCH
<> 144:ef7eb2e8f9f7 63 #define TWI_IDX(obj) ((obj)->i2c.twi_idx)
<> 144:ef7eb2e8f9f7 64 #else
<> 144:ef7eb2e8f9f7 65 #define TWI_IDX(obj) ((obj)->twi_idx)
<> 144:ef7eb2e8f9f7 66 #endif
<> 144:ef7eb2e8f9f7 67 #define TWI_INFO(obj) (&m_twi_info[TWI_IDX(obj)])
<> 144:ef7eb2e8f9f7 68
AnnaBridge 165:e614a9f1c9e2 69 #ifdef TARGET_SDK13
AnnaBridge 165:e614a9f1c9e2 70 #define TWI0_INSTANCE_INDEX 0
AnnaBridge 165:e614a9f1c9e2 71 #define TWI1_INSTANCE_INDEX TWI0_INSTANCE_INDEX+TWI0_ENABLED
AnnaBridge 165:e614a9f1c9e2 72 #endif
AnnaBridge 165:e614a9f1c9e2 73
<> 144:ef7eb2e8f9f7 74 typedef struct {
<> 160:d5399cc887bb 75 bool initialized;
<> 160:d5399cc887bb 76 uint32_t pselsda;
<> 160:d5399cc887bb 77 uint32_t pselscl;
<> 160:d5399cc887bb 78 nrf_twi_frequency_t frequency;
<> 160:d5399cc887bb 79 bool start_twi;
<> 144:ef7eb2e8f9f7 80
<> 160:d5399cc887bb 81 #if DEVICE_I2C_ASYNCH
<> 160:d5399cc887bb 82 volatile bool active;
<> 160:d5399cc887bb 83 uint8_t const *tx;
<> 160:d5399cc887bb 84 size_t tx_length;
<> 160:d5399cc887bb 85 uint8_t *rx;
<> 160:d5399cc887bb 86 size_t rx_length;
<> 160:d5399cc887bb 87 bool stop;
<> 160:d5399cc887bb 88
<> 160:d5399cc887bb 89 volatile uint32_t events;
<> 160:d5399cc887bb 90 void (*handler)(void);
<> 160:d5399cc887bb 91 uint32_t evt_mask;
<> 160:d5399cc887bb 92 #endif // DEVICE_I2C_ASYNCH
<> 144:ef7eb2e8f9f7 93 } twi_info_t;
<> 144:ef7eb2e8f9f7 94 static twi_info_t m_twi_info[TWI_COUNT];
<> 144:ef7eb2e8f9f7 95
<> 160:d5399cc887bb 96 static NRF_TWI_Type * const m_twi_instances[TWI_COUNT] = {
<> 144:ef7eb2e8f9f7 97 #if TWI0_ENABLED
<> 160:d5399cc887bb 98 NRF_TWI0,
<> 144:ef7eb2e8f9f7 99 #endif
<> 144:ef7eb2e8f9f7 100 #if TWI1_ENABLED
<> 160:d5399cc887bb 101 NRF_TWI1,
<> 144:ef7eb2e8f9f7 102 #endif
<> 144:ef7eb2e8f9f7 103 };
<> 144:ef7eb2e8f9f7 104
<> 150:02e0a0aed4ec 105 void SPI0_TWI0_IRQHandler(void);
<> 150:02e0a0aed4ec 106 void SPI1_TWI1_IRQHandler(void);
<> 150:02e0a0aed4ec 107
<> 150:02e0a0aed4ec 108 static const peripheral_handler_desc_t twi_handlers[TWI_COUNT] =
<> 150:02e0a0aed4ec 109 {
AnnaBridge 165:e614a9f1c9e2 110 #if TWI0_ENABLED
<> 150:02e0a0aed4ec 111 {
<> 150:02e0a0aed4ec 112 SPI0_TWI0_IRQn,
<> 150:02e0a0aed4ec 113 (uint32_t) SPI0_TWI0_IRQHandler
<> 150:02e0a0aed4ec 114 },
AnnaBridge 165:e614a9f1c9e2 115 #endif
AnnaBridge 165:e614a9f1c9e2 116 #if TWI1_ENABLED
<> 150:02e0a0aed4ec 117 {
<> 150:02e0a0aed4ec 118 SPI1_TWI1_IRQn,
<> 150:02e0a0aed4ec 119 (uint32_t) SPI1_TWI1_IRQHandler
<> 150:02e0a0aed4ec 120 }
AnnaBridge 165:e614a9f1c9e2 121 #endif
<> 150:02e0a0aed4ec 122 };
<> 160:d5399cc887bb 123 #ifdef NRF51
<> 160:d5399cc887bb 124 #define TWI_IRQ_PRIORITY APP_IRQ_PRIORITY_LOW
AnnaBridge 165:e614a9f1c9e2 125 #elif defined(NRF52) || defined(NRF52840_XXAA)
<> 160:d5399cc887bb 126 #define TWI_IRQ_PRIORITY APP_IRQ_PRIORITY_LOWEST
<> 160:d5399cc887bb 127 #endif
<> 160:d5399cc887bb 128
<> 160:d5399cc887bb 129
<> 160:d5399cc887bb 130 #if DEVICE_I2C_ASYNCH
<> 160:d5399cc887bb 131 static void start_asynch_rx(twi_info_t *twi_info, NRF_TWI_Type *twi)
<> 160:d5399cc887bb 132 {
<> 160:d5399cc887bb 133 if (twi_info->rx_length == 1 && twi_info->stop) {
<> 160:d5399cc887bb 134 nrf_twi_shorts_set(twi, NRF_TWI_SHORT_BB_STOP_MASK);
<> 160:d5399cc887bb 135 } else {
<> 160:d5399cc887bb 136 nrf_twi_shorts_set(twi, NRF_TWI_SHORT_BB_SUSPEND_MASK);
<> 160:d5399cc887bb 137 }
<> 160:d5399cc887bb 138 nrf_twi_task_trigger(twi, NRF_TWI_TASK_STARTRX);
<> 160:d5399cc887bb 139 }
<> 160:d5399cc887bb 140
<> 160:d5399cc887bb 141 static void twi_irq_handler(uint8_t instance_idx)
<> 160:d5399cc887bb 142 {
<> 160:d5399cc887bb 143 twi_info_t *twi_info = &m_twi_info[instance_idx];
<> 160:d5399cc887bb 144
<> 160:d5399cc887bb 145 NRF_TWI_Type *twi = m_twi_instances[instance_idx];
<> 160:d5399cc887bb 146 if (nrf_twi_event_check(twi, NRF_TWI_EVENT_ERROR)) {
<> 160:d5399cc887bb 147 nrf_twi_event_clear(twi, NRF_TWI_EVENT_ERROR);
<> 160:d5399cc887bb 148
<> 160:d5399cc887bb 149 // In case of an error, force STOP.
<> 160:d5399cc887bb 150 // The current transfer may be suspended (if it is RX), so it must be
<> 160:d5399cc887bb 151 // resumed before the STOP task is triggered.
<> 160:d5399cc887bb 152 nrf_twi_task_trigger(twi, NRF_TWI_TASK_RESUME);
<> 160:d5399cc887bb 153 nrf_twi_task_trigger(twi, NRF_TWI_TASK_STOP);
<> 160:d5399cc887bb 154
<> 160:d5399cc887bb 155 uint32_t errorsrc = nrf_twi_errorsrc_get_and_clear(twi);
<> 160:d5399cc887bb 156 twi_info->events |= I2C_EVENT_ERROR;
<> 160:d5399cc887bb 157 if (errorsrc & NRF_TWI_ERROR_ADDRESS_NACK) {
<> 160:d5399cc887bb 158 twi_info->events |= I2C_EVENT_ERROR_NO_SLAVE;
<> 160:d5399cc887bb 159 }
<> 160:d5399cc887bb 160 if (errorsrc & NRF_TWI_ERROR_DATA_NACK) {
<> 160:d5399cc887bb 161 twi_info->events |= I2C_EVENT_TRANSFER_EARLY_NACK;
<> 160:d5399cc887bb 162 }
<> 160:d5399cc887bb 163 }
<> 160:d5399cc887bb 164
<> 160:d5399cc887bb 165 bool finished = false;
<> 160:d5399cc887bb 166
<> 160:d5399cc887bb 167 if (nrf_twi_event_check(twi, NRF_TWI_EVENT_TXDSENT)) {
<> 160:d5399cc887bb 168 nrf_twi_event_clear(twi, NRF_TWI_EVENT_TXDSENT);
<> 160:d5399cc887bb 169
<> 160:d5399cc887bb 170 MBED_ASSERT(twi_info->tx_length > 0);
<> 160:d5399cc887bb 171 --(twi_info->tx_length);
<> 160:d5399cc887bb 172 // Send next byte if there is still something to be sent.
<> 160:d5399cc887bb 173 if (twi_info->tx_length > 0) {
<> 160:d5399cc887bb 174 nrf_twi_txd_set(twi, *(twi_info->tx));
<> 160:d5399cc887bb 175 ++(twi_info->tx);
<> 160:d5399cc887bb 176 // It TX is done, start RX if requested.
<> 160:d5399cc887bb 177 } else if (twi_info->rx_length > 0) {
<> 160:d5399cc887bb 178 start_asynch_rx(twi_info, twi);
<> 160:d5399cc887bb 179 // If there is nothing more to do, finalize the transfer.
<> 160:d5399cc887bb 180 } else {
<> 160:d5399cc887bb 181 if (twi_info->stop) {
<> 160:d5399cc887bb 182 nrf_twi_task_trigger(twi, NRF_TWI_TASK_STOP);
<> 160:d5399cc887bb 183 } else {
<> 160:d5399cc887bb 184 nrf_twi_task_trigger(twi, NRF_TWI_TASK_SUSPEND);
<> 160:d5399cc887bb 185 finished = true;
<> 160:d5399cc887bb 186 }
<> 160:d5399cc887bb 187 twi_info->events |= I2C_EVENT_TRANSFER_COMPLETE;
<> 160:d5399cc887bb 188 }
<> 160:d5399cc887bb 189 }
<> 160:d5399cc887bb 190
<> 160:d5399cc887bb 191 if (nrf_twi_event_check(twi, NRF_TWI_EVENT_RXDREADY)) {
<> 160:d5399cc887bb 192 nrf_twi_event_clear(twi, NRF_TWI_EVENT_RXDREADY);
<> 160:d5399cc887bb 193
<> 160:d5399cc887bb 194 MBED_ASSERT(twi_info->rx_length > 0);
<> 160:d5399cc887bb 195 *(twi_info->rx) = nrf_twi_rxd_get(twi);
<> 160:d5399cc887bb 196 ++(twi_info->rx);
<> 160:d5399cc887bb 197 --(twi_info->rx_length);
<> 160:d5399cc887bb 198
<> 160:d5399cc887bb 199 if (twi_info->rx_length > 0) {
<> 160:d5399cc887bb 200 // If more bytes should be received, resume the transfer
<> 160:d5399cc887bb 201 // (in case the stop condition should be generated after the next
<> 160:d5399cc887bb 202 // byte, change the shortcuts configuration first).
<> 160:d5399cc887bb 203 if (twi_info->rx_length == 1 && twi_info->stop) {
<> 160:d5399cc887bb 204 nrf_twi_shorts_set(twi, NRF_TWI_SHORT_BB_STOP_MASK);
<> 160:d5399cc887bb 205 }
<> 160:d5399cc887bb 206 nrf_twi_task_trigger(twi, NRF_TWI_TASK_RESUME);
<> 160:d5399cc887bb 207 } else {
<> 160:d5399cc887bb 208 // If all requested bytes were received, finalize the transfer.
<> 160:d5399cc887bb 209 finished = true;
<> 160:d5399cc887bb 210 twi_info->events |= I2C_EVENT_TRANSFER_COMPLETE;
<> 160:d5399cc887bb 211 }
<> 160:d5399cc887bb 212 }
<> 160:d5399cc887bb 213
<> 160:d5399cc887bb 214 if (finished ||
<> 160:d5399cc887bb 215 nrf_twi_event_check(twi, NRF_TWI_EVENT_STOPPED) ||
<> 160:d5399cc887bb 216 (nrf_twi_int_enable_check(twi, NRF_TWI_INT_SUSPENDED_MASK) &&
<> 160:d5399cc887bb 217 nrf_twi_event_check(twi, NRF_TWI_EVENT_SUSPENDED))) {
<> 160:d5399cc887bb 218 // There is no need to clear the STOPPED and SUSPENDED events here,
<> 160:d5399cc887bb 219 // they will no longer generate the interrupt - see below.
<> 160:d5399cc887bb 220
<> 160:d5399cc887bb 221 nrf_twi_shorts_set(twi, 0);
<> 160:d5399cc887bb 222 // Disable all interrupt sources.
<> 160:d5399cc887bb 223 nrf_twi_int_disable(twi, UINT32_MAX);
<> 160:d5399cc887bb 224 twi_info->active = false;
<> 160:d5399cc887bb 225
<> 160:d5399cc887bb 226 if (twi_info->handler) {
<> 160:d5399cc887bb 227 twi_info->handler();
<> 160:d5399cc887bb 228 }
<> 160:d5399cc887bb 229 }
<> 160:d5399cc887bb 230 }
<> 160:d5399cc887bb 231
<> 160:d5399cc887bb 232 #if TWI0_ENABLED
<> 160:d5399cc887bb 233 static void irq_handler_twi0(void)
<> 160:d5399cc887bb 234 {
<> 160:d5399cc887bb 235 twi_irq_handler(TWI0_INSTANCE_INDEX);
<> 160:d5399cc887bb 236 }
<> 160:d5399cc887bb 237 #endif
<> 160:d5399cc887bb 238 #if TWI1_ENABLED
<> 160:d5399cc887bb 239 static void irq_handler_twi1(void)
<> 160:d5399cc887bb 240 {
<> 160:d5399cc887bb 241 twi_irq_handler(TWI1_INSTANCE_INDEX);
<> 160:d5399cc887bb 242 }
<> 160:d5399cc887bb 243 #endif
<> 160:d5399cc887bb 244 static nrf_drv_irq_handler_t const m_twi_irq_handlers[TWI_COUNT] =
<> 160:d5399cc887bb 245 {
<> 160:d5399cc887bb 246 #if TWI0_ENABLED
<> 160:d5399cc887bb 247 irq_handler_twi0,
<> 160:d5399cc887bb 248 #endif
<> 160:d5399cc887bb 249 #if TWI1_ENABLED
<> 160:d5399cc887bb 250 irq_handler_twi1,
<> 160:d5399cc887bb 251 #endif
<> 160:d5399cc887bb 252 };
<> 160:d5399cc887bb 253 #endif // DEVICE_I2C_ASYNCH
<> 160:d5399cc887bb 254
<> 160:d5399cc887bb 255
<> 160:d5399cc887bb 256 static void configure_twi_pin(uint32_t pin, nrf_gpio_pin_dir_t dir)
<> 160:d5399cc887bb 257 {
<> 160:d5399cc887bb 258 nrf_gpio_cfg(pin,
<> 160:d5399cc887bb 259 dir,
<> 160:d5399cc887bb 260 NRF_GPIO_PIN_INPUT_CONNECT,
<> 160:d5399cc887bb 261 NRF_GPIO_PIN_PULLUP,
<> 160:d5399cc887bb 262 NRF_GPIO_PIN_S0D1,
<> 160:d5399cc887bb 263 NRF_GPIO_PIN_NOSENSE);
<> 160:d5399cc887bb 264 }
<> 160:d5399cc887bb 265
<> 160:d5399cc887bb 266 static void twi_clear_bus(twi_info_t *twi_info)
<> 160:d5399cc887bb 267 {
<> 160:d5399cc887bb 268 // Try to set SDA high, and check if no slave tries to drive it low.
<> 160:d5399cc887bb 269 nrf_gpio_pin_set(twi_info->pselsda);
<> 160:d5399cc887bb 270 configure_twi_pin(twi_info->pselsda, NRF_GPIO_PIN_DIR_OUTPUT);
<> 160:d5399cc887bb 271 // In case SDA is low, make up to 9 cycles on SCL line to help the slave
<> 160:d5399cc887bb 272 // that pulls SDA low release it.
<> 160:d5399cc887bb 273 if (!nrf_gpio_pin_read(twi_info->pselsda)) {
<> 160:d5399cc887bb 274 nrf_gpio_pin_set(twi_info->pselscl);
<> 160:d5399cc887bb 275 configure_twi_pin(twi_info->pselscl, NRF_GPIO_PIN_DIR_OUTPUT);
<> 160:d5399cc887bb 276 nrf_delay_us(4);
<> 160:d5399cc887bb 277
<> 160:d5399cc887bb 278 for (int i = 0; i < 9; i++) {
<> 160:d5399cc887bb 279 if (nrf_gpio_pin_read(twi_info->pselsda)) {
<> 160:d5399cc887bb 280 break;
<> 160:d5399cc887bb 281 }
<> 160:d5399cc887bb 282 nrf_gpio_pin_clear(twi_info->pselscl);
<> 160:d5399cc887bb 283 nrf_delay_us(4);
<> 160:d5399cc887bb 284 nrf_gpio_pin_set(twi_info->pselscl);
<> 160:d5399cc887bb 285 nrf_delay_us(4);
<> 160:d5399cc887bb 286 }
<> 160:d5399cc887bb 287
<> 160:d5399cc887bb 288 // Finally, generate STOP condition to put the bus into initial state.
<> 160:d5399cc887bb 289 nrf_gpio_pin_clear(twi_info->pselsda);
<> 160:d5399cc887bb 290 nrf_delay_us(4);
<> 160:d5399cc887bb 291 nrf_gpio_pin_set(twi_info->pselsda);
<> 160:d5399cc887bb 292 }
<> 160:d5399cc887bb 293 }
<> 150:02e0a0aed4ec 294
<> 144:ef7eb2e8f9f7 295 void i2c_init(i2c_t *obj, PinName sda, PinName scl)
<> 144:ef7eb2e8f9f7 296 {
Kojto 169:e3b6fe271b81 297 ret_code_t ret;
<> 144:ef7eb2e8f9f7 298 int i;
Kojto 169:e3b6fe271b81 299
<> 144:ef7eb2e8f9f7 300 for (i = 0; i < TWI_COUNT; ++i) {
<> 144:ef7eb2e8f9f7 301 if (m_twi_info[i].initialized &&
<> 160:d5399cc887bb 302 m_twi_info[i].pselsda == (uint32_t)sda &&
<> 160:d5399cc887bb 303 m_twi_info[i].pselscl == (uint32_t)scl) {
<> 144:ef7eb2e8f9f7 304 TWI_IDX(obj) = i;
<> 160:d5399cc887bb 305 TWI_INFO(obj)->frequency = NRF_TWI_FREQ_100K;
<> 144:ef7eb2e8f9f7 306 i2c_reset(obj);
<> 144:ef7eb2e8f9f7 307 return;
<> 144:ef7eb2e8f9f7 308 }
<> 144:ef7eb2e8f9f7 309 }
<> 144:ef7eb2e8f9f7 310
<> 144:ef7eb2e8f9f7 311 for (i = 0; i < TWI_COUNT; ++i) {
<> 144:ef7eb2e8f9f7 312 if (!m_twi_info[i].initialized) {
Kojto 169:e3b6fe271b81 313 ret = nrf_drv_common_per_res_acquire(m_twi_instances[i],
Kojto 169:e3b6fe271b81 314 m_twi_irq_handlers[i]);
Kojto 169:e3b6fe271b81 315
Kojto 169:e3b6fe271b81 316 if (ret != NRF_SUCCESS) {
Kojto 169:e3b6fe271b81 317 continue; /* the hw resource is busy - test another one */
Kojto 169:e3b6fe271b81 318 }
Kojto 169:e3b6fe271b81 319
<> 160:d5399cc887bb 320 TWI_IDX(obj) = i;
<> 150:02e0a0aed4ec 321
<> 160:d5399cc887bb 322 twi_info_t *twi_info = TWI_INFO(obj);
<> 160:d5399cc887bb 323 twi_info->initialized = true;
<> 160:d5399cc887bb 324 twi_info->pselsda = (uint32_t)sda;
<> 160:d5399cc887bb 325 twi_info->pselscl = (uint32_t)scl;
<> 160:d5399cc887bb 326 twi_info->frequency = NRF_TWI_FREQ_100K;
<> 160:d5399cc887bb 327 twi_info->start_twi = false;
<> 160:d5399cc887bb 328 #if DEVICE_I2C_ASYNCH
<> 160:d5399cc887bb 329 twi_info->active = false;
<> 160:d5399cc887bb 330 #endif
<> 160:d5399cc887bb 331
<> 160:d5399cc887bb 332 twi_clear_bus(twi_info);
<> 150:02e0a0aed4ec 333
<> 160:d5399cc887bb 334 configure_twi_pin(twi_info->pselsda, NRF_GPIO_PIN_DIR_INPUT);
<> 160:d5399cc887bb 335 configure_twi_pin(twi_info->pselscl, NRF_GPIO_PIN_DIR_INPUT);
<> 160:d5399cc887bb 336
<> 160:d5399cc887bb 337 i2c_reset(obj);
<> 144:ef7eb2e8f9f7 338
<> 160:d5399cc887bb 339 #if DEVICE_I2C_ASYNCH
<> 160:d5399cc887bb 340 NVIC_SetVector(twi_handlers[i].IRQn, twi_handlers[i].vector);
<> 160:d5399cc887bb 341 nrf_drv_common_irq_enable(twi_handlers[i].IRQn, TWI_IRQ_PRIORITY);
<> 160:d5399cc887bb 342 #endif
<> 160:d5399cc887bb 343
<> 160:d5399cc887bb 344 return;
<> 144:ef7eb2e8f9f7 345 }
<> 144:ef7eb2e8f9f7 346 }
<> 144:ef7eb2e8f9f7 347
<> 144:ef7eb2e8f9f7 348 error("No available I2C peripheral\r\n");
<> 144:ef7eb2e8f9f7 349 }
<> 144:ef7eb2e8f9f7 350
<> 144:ef7eb2e8f9f7 351 void i2c_reset(i2c_t *obj)
<> 144:ef7eb2e8f9f7 352 {
<> 144:ef7eb2e8f9f7 353 twi_info_t *twi_info = TWI_INFO(obj);
<> 160:d5399cc887bb 354 NRF_TWI_Type *twi = m_twi_instances[TWI_IDX(obj)];
<> 144:ef7eb2e8f9f7 355
<> 160:d5399cc887bb 356 nrf_twi_disable(twi);
<> 160:d5399cc887bb 357 nrf_twi_pins_set(twi, twi_info->pselscl, twi_info->pselsda);
<> 160:d5399cc887bb 358 nrf_twi_frequency_set(twi, twi_info->frequency);
<> 160:d5399cc887bb 359 nrf_twi_enable(twi);
<> 144:ef7eb2e8f9f7 360 }
<> 144:ef7eb2e8f9f7 361
<> 144:ef7eb2e8f9f7 362 int i2c_start(i2c_t *obj)
<> 144:ef7eb2e8f9f7 363 {
<> 160:d5399cc887bb 364 twi_info_t *twi_info = TWI_INFO(obj);
<> 160:d5399cc887bb 365 #if DEVICE_I2C_ASYNCH
<> 160:d5399cc887bb 366 if (twi_info->active) {
<> 160:d5399cc887bb 367 return I2C_ERROR_BUS_BUSY;
<> 160:d5399cc887bb 368 }
<> 160:d5399cc887bb 369 #endif
<> 160:d5399cc887bb 370 twi_info->start_twi = true;
<> 144:ef7eb2e8f9f7 371
<> 160:d5399cc887bb 372 return 0;
<> 144:ef7eb2e8f9f7 373 }
<> 144:ef7eb2e8f9f7 374
<> 144:ef7eb2e8f9f7 375 int i2c_stop(i2c_t *obj)
<> 144:ef7eb2e8f9f7 376 {
<> 160:d5399cc887bb 377 NRF_TWI_Type *twi = m_twi_instances[TWI_IDX(obj)];
AnnaBridge 176:447f873cad2f 378 uint32_t t0;
<> 144:ef7eb2e8f9f7 379
<> 160:d5399cc887bb 380 // The current transfer may be suspended (if it is RX), so it must be
<> 160:d5399cc887bb 381 // resumed before the STOP task is triggered.
<> 160:d5399cc887bb 382 nrf_twi_task_trigger(twi, NRF_TWI_TASK_RESUME);
<> 160:d5399cc887bb 383 nrf_twi_task_trigger(twi, NRF_TWI_TASK_STOP);
AnnaBridge 176:447f873cad2f 384
AnnaBridge 176:447f873cad2f 385 t0 = ticker_read(get_us_ticker_data());
AnnaBridge 176:447f873cad2f 386
<> 160:d5399cc887bb 387 do {
<> 160:d5399cc887bb 388 if (nrf_twi_event_check(twi, NRF_TWI_EVENT_STOPPED)) {
<> 160:d5399cc887bb 389 return 0;
<> 160:d5399cc887bb 390 }
AnnaBridge 176:447f873cad2f 391 } while (((uint32_t)ticker_read(get_us_ticker_data()) - t0) < I2C_TIMEOUT_VALUE_US);
<> 160:d5399cc887bb 392
<> 160:d5399cc887bb 393 return 1;
<> 144:ef7eb2e8f9f7 394 }
<> 144:ef7eb2e8f9f7 395
<> 144:ef7eb2e8f9f7 396 void i2c_frequency(i2c_t *obj, int hz)
<> 144:ef7eb2e8f9f7 397 {
<> 144:ef7eb2e8f9f7 398 twi_info_t *twi_info = TWI_INFO(obj);
<> 160:d5399cc887bb 399 NRF_TWI_Type *twi = m_twi_instances[TWI_IDX(obj)];
<> 144:ef7eb2e8f9f7 400
<> 144:ef7eb2e8f9f7 401 if (hz < 250000) {
<> 160:d5399cc887bb 402 twi_info->frequency = NRF_TWI_FREQ_100K;
<> 144:ef7eb2e8f9f7 403 } else if (hz < 400000) {
<> 160:d5399cc887bb 404 twi_info->frequency = NRF_TWI_FREQ_250K;
<> 144:ef7eb2e8f9f7 405 } else {
<> 160:d5399cc887bb 406 twi_info->frequency = NRF_TWI_FREQ_400K;
<> 144:ef7eb2e8f9f7 407 }
<> 160:d5399cc887bb 408 nrf_twi_frequency_set(twi, twi_info->frequency);
<> 160:d5399cc887bb 409 }
<> 160:d5399cc887bb 410
<> 160:d5399cc887bb 411 static uint8_t twi_address(int i2c_address)
<> 160:d5399cc887bb 412 {
<> 160:d5399cc887bb 413 // The TWI peripheral requires 7-bit slave address (without R/W bit).
<> 160:d5399cc887bb 414 return (i2c_address >> 1);
<> 160:d5399cc887bb 415 }
<> 160:d5399cc887bb 416
<> 160:d5399cc887bb 417 static void start_twi_read(NRF_TWI_Type *twi, int address)
<> 160:d5399cc887bb 418 {
<> 160:d5399cc887bb 419 nrf_twi_event_clear(twi, NRF_TWI_EVENT_STOPPED);
<> 160:d5399cc887bb 420 nrf_twi_event_clear(twi, NRF_TWI_EVENT_RXDREADY);
<> 160:d5399cc887bb 421 nrf_twi_event_clear(twi, NRF_TWI_EVENT_ERROR);
<> 160:d5399cc887bb 422 (void)nrf_twi_errorsrc_get_and_clear(twi);
<> 160:d5399cc887bb 423
<> 160:d5399cc887bb 424 nrf_twi_shorts_set(twi, NRF_TWI_SHORT_BB_SUSPEND_MASK);
<> 160:d5399cc887bb 425
<> 160:d5399cc887bb 426 nrf_twi_address_set(twi, twi_address(address));
<> 160:d5399cc887bb 427 nrf_twi_task_trigger(twi, NRF_TWI_TASK_RESUME);
<> 160:d5399cc887bb 428 nrf_twi_task_trigger(twi, NRF_TWI_TASK_STARTRX);
<> 144:ef7eb2e8f9f7 429 }
<> 144:ef7eb2e8f9f7 430
<> 144:ef7eb2e8f9f7 431 int i2c_read(i2c_t *obj, int address, char *data, int length, int stop)
<> 144:ef7eb2e8f9f7 432 {
<> 160:d5399cc887bb 433 // Zero-length RX transfers are not supported. Such transfers cannot
<> 160:d5399cc887bb 434 // be easily achieved with TWI peripheral (some dirty tricks would be
<> 160:d5399cc887bb 435 // required for this), and they are actually useless (TX can be used
<> 160:d5399cc887bb 436 // to check if the address is acknowledged by a slave).
<> 160:d5399cc887bb 437 MBED_ASSERT(length > 0);
<> 144:ef7eb2e8f9f7 438
<> 144:ef7eb2e8f9f7 439 twi_info_t *twi_info = TWI_INFO(obj);
<> 160:d5399cc887bb 440 #if DEVICE_I2C_ASYNCH
<> 160:d5399cc887bb 441 if (twi_info->active) {
<> 160:d5399cc887bb 442 return I2C_ERROR_BUS_BUSY;
<> 160:d5399cc887bb 443 }
<> 160:d5399cc887bb 444 #endif
<> 160:d5399cc887bb 445 twi_info->start_twi = false;
<> 160:d5399cc887bb 446
<> 160:d5399cc887bb 447 NRF_TWI_Type *twi = m_twi_instances[TWI_IDX(obj)];
<> 160:d5399cc887bb 448 start_twi_read(twi, address);
<> 160:d5399cc887bb 449
<> 160:d5399cc887bb 450 int result = length;
<> 160:d5399cc887bb 451 while (length > 0) {
<> 160:d5399cc887bb 452 int byte_read_result = i2c_byte_read(obj, (stop && length == 1));
<> 160:d5399cc887bb 453 if (byte_read_result < 0) {
<> 160:d5399cc887bb 454 // When an error occurs, return the number of bytes that have been
<> 160:d5399cc887bb 455 // received successfully.
<> 160:d5399cc887bb 456 result -= length;
<> 160:d5399cc887bb 457 // Force STOP condition.
<> 160:d5399cc887bb 458 stop = 1;
<> 160:d5399cc887bb 459 break;
<> 160:d5399cc887bb 460 }
<> 160:d5399cc887bb 461 *data++ = (uint8_t)byte_read_result;
<> 160:d5399cc887bb 462 --length;
<> 160:d5399cc887bb 463 }
<> 160:d5399cc887bb 464
<> 160:d5399cc887bb 465 if (stop) {
<> 160:d5399cc887bb 466 (void)i2c_stop(obj);
<> 160:d5399cc887bb 467 }
<> 160:d5399cc887bb 468
<> 160:d5399cc887bb 469 return result;
<> 160:d5399cc887bb 470 }
<> 144:ef7eb2e8f9f7 471
<> 160:d5399cc887bb 472 static uint8_t twi_byte_write(NRF_TWI_Type *twi, uint8_t data)
<> 160:d5399cc887bb 473 {
AnnaBridge 176:447f873cad2f 474 uint32_t t0;
AnnaBridge 176:447f873cad2f 475
<> 160:d5399cc887bb 476 nrf_twi_event_clear(twi, NRF_TWI_EVENT_TXDSENT);
<> 160:d5399cc887bb 477 nrf_twi_event_clear(twi, NRF_TWI_EVENT_ERROR);
<> 160:d5399cc887bb 478
<> 160:d5399cc887bb 479 nrf_twi_txd_set(twi, data);
AnnaBridge 176:447f873cad2f 480
AnnaBridge 176:447f873cad2f 481 t0 = ticker_read(get_us_ticker_data());
AnnaBridge 176:447f873cad2f 482
<> 160:d5399cc887bb 483 do {
<> 160:d5399cc887bb 484 if (nrf_twi_event_check(twi, NRF_TWI_EVENT_TXDSENT)) {
<> 160:d5399cc887bb 485 nrf_twi_event_clear(twi, NRF_TWI_EVENT_TXDSENT);
<> 160:d5399cc887bb 486 return 1; // ACK received
<> 160:d5399cc887bb 487 }
<> 160:d5399cc887bb 488 if (nrf_twi_event_check(twi, NRF_TWI_EVENT_ERROR)) {
<> 160:d5399cc887bb 489 nrf_twi_event_clear(twi, NRF_TWI_EVENT_ERROR);
<> 160:d5399cc887bb 490 return 0; // some error occurred
<> 160:d5399cc887bb 491 }
AnnaBridge 176:447f873cad2f 492 } while (((uint32_t)ticker_read(get_us_ticker_data()) - t0) < I2C_TIMEOUT_VALUE_US);
<> 160:d5399cc887bb 493
<> 160:d5399cc887bb 494 return 2; // timeout;
<> 160:d5399cc887bb 495 }
<> 160:d5399cc887bb 496
<> 160:d5399cc887bb 497 static void start_twi_write(NRF_TWI_Type *twi, int address)
<> 160:d5399cc887bb 498 {
<> 160:d5399cc887bb 499 nrf_twi_event_clear(twi, NRF_TWI_EVENT_STOPPED);
<> 160:d5399cc887bb 500 nrf_twi_event_clear(twi, NRF_TWI_EVENT_TXDSENT);
<> 160:d5399cc887bb 501 nrf_twi_event_clear(twi, NRF_TWI_EVENT_ERROR);
<> 160:d5399cc887bb 502 (void)nrf_twi_errorsrc_get_and_clear(twi);
<> 160:d5399cc887bb 503
<> 160:d5399cc887bb 504 nrf_twi_shorts_set(twi, 0);
<> 160:d5399cc887bb 505
<> 160:d5399cc887bb 506 nrf_twi_address_set(twi, twi_address(address));
<> 160:d5399cc887bb 507 nrf_twi_task_trigger(twi, NRF_TWI_TASK_RESUME);
<> 160:d5399cc887bb 508 nrf_twi_task_trigger(twi, NRF_TWI_TASK_STARTTX);
<> 144:ef7eb2e8f9f7 509 }
<> 144:ef7eb2e8f9f7 510
<> 144:ef7eb2e8f9f7 511 int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop)
<> 144:ef7eb2e8f9f7 512 {
<> 144:ef7eb2e8f9f7 513 twi_info_t *twi_info = TWI_INFO(obj);
AnnaBridge 176:447f873cad2f 514 bool timeout = false;
AnnaBridge 176:447f873cad2f 515 uint32_t t0, t1;
AnnaBridge 176:447f873cad2f 516
<> 160:d5399cc887bb 517 #if DEVICE_I2C_ASYNCH
<> 160:d5399cc887bb 518 if (twi_info->active) {
<> 160:d5399cc887bb 519 return I2C_ERROR_BUS_BUSY;
<> 160:d5399cc887bb 520 }
<> 160:d5399cc887bb 521 #endif
<> 160:d5399cc887bb 522 twi_info->start_twi = false;
<> 160:d5399cc887bb 523
<> 160:d5399cc887bb 524 NRF_TWI_Type *twi = m_twi_instances[TWI_IDX(obj)];
<> 160:d5399cc887bb 525 start_twi_write(twi, address);
<> 160:d5399cc887bb 526
<> 160:d5399cc887bb 527 // Special case - transaction with no data.
<> 160:d5399cc887bb 528 // It can be used to check if a slave acknowledges the address.
<> 160:d5399cc887bb 529 if (length == 0) {
<> 160:d5399cc887bb 530 nrf_twi_event_t event;
<> 160:d5399cc887bb 531 if (stop) {
<> 160:d5399cc887bb 532 event = NRF_TWI_EVENT_STOPPED;
<> 160:d5399cc887bb 533 nrf_twi_task_trigger(twi, NRF_TWI_TASK_STOP);
<> 160:d5399cc887bb 534 } else {
<> 160:d5399cc887bb 535 event = NRF_TWI_EVENT_SUSPENDED;
<> 160:d5399cc887bb 536 nrf_twi_event_clear(twi, event);
<> 160:d5399cc887bb 537 nrf_twi_task_trigger(twi, NRF_TWI_TASK_SUSPEND);
<> 160:d5399cc887bb 538 }
AnnaBridge 176:447f873cad2f 539
AnnaBridge 176:447f873cad2f 540 t0 = ticker_read(get_us_ticker_data());
AnnaBridge 176:447f873cad2f 541
<> 160:d5399cc887bb 542 do {
<> 160:d5399cc887bb 543 if (nrf_twi_event_check(twi, event)) {
<> 160:d5399cc887bb 544 break;
<> 160:d5399cc887bb 545 }
AnnaBridge 176:447f873cad2f 546 t1 = ticker_read(get_us_ticker_data());
AnnaBridge 176:447f873cad2f 547 timeout = (t1 - t0) >= I2C_TIMEOUT_VALUE_US;
AnnaBridge 176:447f873cad2f 548 } while (!timeout);
<> 144:ef7eb2e8f9f7 549
<> 160:d5399cc887bb 550 uint32_t errorsrc = nrf_twi_errorsrc_get_and_clear(twi);
<> 160:d5399cc887bb 551 if (errorsrc & NRF_TWI_ERROR_ADDRESS_NACK) {
<> 160:d5399cc887bb 552 if (!stop) {
<> 160:d5399cc887bb 553 i2c_stop(obj);
<> 160:d5399cc887bb 554 }
<> 160:d5399cc887bb 555 return I2C_ERROR_NO_SLAVE;
<> 160:d5399cc887bb 556 }
<> 160:d5399cc887bb 557
AnnaBridge 176:447f873cad2f 558 return (timeout ? I2C_ERROR_BUS_BUSY : 0);
<> 144:ef7eb2e8f9f7 559 }
<> 160:d5399cc887bb 560
<> 160:d5399cc887bb 561 int result = length;
<> 160:d5399cc887bb 562 do {
<> 160:d5399cc887bb 563 uint8_t byte_write_result = twi_byte_write(twi, (uint8_t)*data++);
<> 160:d5399cc887bb 564 if (byte_write_result != 1) {
<> 160:d5399cc887bb 565 if (byte_write_result == 0) {
<> 160:d5399cc887bb 566 // Check what kind of error has been signaled by TWI.
<> 160:d5399cc887bb 567 uint32_t errorsrc = nrf_twi_errorsrc_get_and_clear(twi);
<> 160:d5399cc887bb 568 if (errorsrc & NRF_TWI_ERROR_ADDRESS_NACK) {
<> 160:d5399cc887bb 569 result = I2C_ERROR_NO_SLAVE;
<> 160:d5399cc887bb 570 } else {
<> 160:d5399cc887bb 571 // Some other error - return the number of bytes that
<> 160:d5399cc887bb 572 // have been sent successfully.
<> 160:d5399cc887bb 573 result -= length;
<> 160:d5399cc887bb 574 }
<> 160:d5399cc887bb 575 } else {
<> 160:d5399cc887bb 576 result = I2C_ERROR_BUS_BUSY;
<> 160:d5399cc887bb 577 }
<> 160:d5399cc887bb 578 // Force STOP condition.
<> 160:d5399cc887bb 579 stop = 1;
<> 160:d5399cc887bb 580 break;
<> 160:d5399cc887bb 581 }
<> 160:d5399cc887bb 582 --length;
<> 160:d5399cc887bb 583 } while (length > 0);
<> 160:d5399cc887bb 584
<> 160:d5399cc887bb 585 if (stop) {
<> 160:d5399cc887bb 586 (void)i2c_stop(obj);
<> 160:d5399cc887bb 587 }
<> 160:d5399cc887bb 588
<> 160:d5399cc887bb 589 return result;
<> 144:ef7eb2e8f9f7 590 }
<> 144:ef7eb2e8f9f7 591
<> 144:ef7eb2e8f9f7 592 int i2c_byte_read(i2c_t *obj, int last)
<> 144:ef7eb2e8f9f7 593 {
<> 160:d5399cc887bb 594 NRF_TWI_Type *twi = m_twi_instances[TWI_IDX(obj)];
AnnaBridge 176:447f873cad2f 595 uint32_t t0;
<> 160:d5399cc887bb 596
<> 160:d5399cc887bb 597 if (last) {
<> 160:d5399cc887bb 598 nrf_twi_shorts_set(twi, NRF_TWI_SHORT_BB_STOP_MASK);
<> 160:d5399cc887bb 599 }
<> 160:d5399cc887bb 600 nrf_twi_task_trigger(twi, NRF_TWI_TASK_RESUME);
<> 144:ef7eb2e8f9f7 601
AnnaBridge 176:447f873cad2f 602 t0 = ticker_read(get_us_ticker_data());
AnnaBridge 176:447f873cad2f 603
<> 160:d5399cc887bb 604 do {
<> 160:d5399cc887bb 605 if (nrf_twi_event_check(twi, NRF_TWI_EVENT_RXDREADY)) {
<> 160:d5399cc887bb 606 nrf_twi_event_clear(twi, NRF_TWI_EVENT_RXDREADY);
<> 160:d5399cc887bb 607 return nrf_twi_rxd_get(twi);
<> 160:d5399cc887bb 608 }
<> 160:d5399cc887bb 609 if (nrf_twi_event_check(twi, NRF_TWI_EVENT_ERROR)) {
<> 160:d5399cc887bb 610 nrf_twi_event_clear(twi, NRF_TWI_EVENT_ERROR);
<> 160:d5399cc887bb 611 return I2C_ERROR_NO_SLAVE;
<> 160:d5399cc887bb 612 }
AnnaBridge 176:447f873cad2f 613 } while (((uint32_t)ticker_read(get_us_ticker_data()) - t0) < I2C_TIMEOUT_VALUE_US);
<> 160:d5399cc887bb 614
<> 160:d5399cc887bb 615 return I2C_ERROR_BUS_BUSY;
<> 144:ef7eb2e8f9f7 616 }
<> 144:ef7eb2e8f9f7 617
<> 144:ef7eb2e8f9f7 618 int i2c_byte_write(i2c_t *obj, int data)
<> 144:ef7eb2e8f9f7 619 {
<> 160:d5399cc887bb 620 NRF_TWI_Type *twi = m_twi_instances[TWI_IDX(obj)];
<> 160:d5399cc887bb 621 twi_info_t *twi_info = TWI_INFO(obj);
<> 160:d5399cc887bb 622 if (twi_info->start_twi) {
<> 160:d5399cc887bb 623 twi_info->start_twi = false;
<> 144:ef7eb2e8f9f7 624
<> 160:d5399cc887bb 625 if (data & 1) {
<> 160:d5399cc887bb 626 start_twi_read(twi, data);
<> 160:d5399cc887bb 627 } else {
<> 160:d5399cc887bb 628 start_twi_write(twi, data);
<> 160:d5399cc887bb 629 }
<> 160:d5399cc887bb 630 return 1;
<> 160:d5399cc887bb 631 } else {
<> 160:d5399cc887bb 632 nrf_twi_task_trigger(twi, NRF_TWI_TASK_RESUME);
<> 160:d5399cc887bb 633 // 0 - TWI signaled error (NAK is the only possibility here)
<> 160:d5399cc887bb 634 // 1 - ACK received
<> 160:d5399cc887bb 635 // 2 - timeout (clock stretched for too long?)
<> 160:d5399cc887bb 636 return twi_byte_write(twi, (uint8_t)data);
<> 160:d5399cc887bb 637 }
<> 144:ef7eb2e8f9f7 638 }
<> 144:ef7eb2e8f9f7 639
<> 144:ef7eb2e8f9f7 640
<> 144:ef7eb2e8f9f7 641 #if DEVICE_I2C_ASYNCH
<> 144:ef7eb2e8f9f7 642 void i2c_transfer_asynch(i2c_t *obj, const void *tx, size_t tx_length,
<> 144:ef7eb2e8f9f7 643 void *rx, size_t rx_length, uint32_t address,
<> 144:ef7eb2e8f9f7 644 uint32_t stop, uint32_t handler,
<> 144:ef7eb2e8f9f7 645 uint32_t event, DMAUsage hint)
<> 144:ef7eb2e8f9f7 646 {
<> 144:ef7eb2e8f9f7 647 (void)hint;
<> 144:ef7eb2e8f9f7 648
<> 144:ef7eb2e8f9f7 649 twi_info_t *twi_info = TWI_INFO(obj);
<> 160:d5399cc887bb 650 if (twi_info->active) {
<> 160:d5399cc887bb 651 return;
<> 160:d5399cc887bb 652 }
<> 160:d5399cc887bb 653 twi_info->active = true;
<> 160:d5399cc887bb 654 twi_info->events = 0;
<> 160:d5399cc887bb 655 twi_info->handler = (void (*)(void))handler;
<> 160:d5399cc887bb 656 twi_info->evt_mask = event;
<> 160:d5399cc887bb 657 twi_info->tx_length = tx_length;
<> 160:d5399cc887bb 658 twi_info->tx = tx;
<> 160:d5399cc887bb 659 twi_info->rx_length = rx_length;
<> 160:d5399cc887bb 660 twi_info->rx = rx;
<> 160:d5399cc887bb 661 twi_info->stop = stop;
<> 144:ef7eb2e8f9f7 662
<> 160:d5399cc887bb 663 NRF_TWI_Type *twi = m_twi_instances[TWI_IDX(obj)];
<> 160:d5399cc887bb 664
<> 160:d5399cc887bb 665 nrf_twi_event_clear(twi, NRF_TWI_EVENT_TXDSENT);
<> 160:d5399cc887bb 666 nrf_twi_event_clear(twi, NRF_TWI_EVENT_RXDREADY);
<> 160:d5399cc887bb 667 nrf_twi_event_clear(twi, NRF_TWI_EVENT_STOPPED);
<> 160:d5399cc887bb 668 nrf_twi_event_clear(twi, NRF_TWI_EVENT_SUSPENDED);
<> 160:d5399cc887bb 669 nrf_twi_event_clear(twi, NRF_TWI_EVENT_ERROR);
<> 160:d5399cc887bb 670 (void)nrf_twi_errorsrc_get_and_clear(twi);
<> 144:ef7eb2e8f9f7 671
<> 160:d5399cc887bb 672 nrf_twi_address_set(twi, twi_address(address));
<> 160:d5399cc887bb 673 nrf_twi_task_trigger(twi, NRF_TWI_TASK_RESUME);
<> 160:d5399cc887bb 674 // TX only, or TX + RX (after a repeated start).
<> 160:d5399cc887bb 675 if (tx_length > 0) {
<> 160:d5399cc887bb 676 nrf_twi_task_trigger(twi, NRF_TWI_TASK_STARTTX);
<> 160:d5399cc887bb 677 nrf_twi_txd_set(twi, *(twi_info->tx));
<> 160:d5399cc887bb 678 ++(twi_info->tx);
<> 160:d5399cc887bb 679 // RX only.
<> 160:d5399cc887bb 680 } else if (rx_length > 0) {
<> 160:d5399cc887bb 681 start_asynch_rx(twi_info, twi);
<> 160:d5399cc887bb 682 // Both 'tx_length' and 'rx_length' are 0 - this case may be used
<> 160:d5399cc887bb 683 // to test if the slave is presentand ready for transfer (by just
<> 160:d5399cc887bb 684 // sending the address and checking if it is acknowledged).
<> 160:d5399cc887bb 685 } else {
<> 160:d5399cc887bb 686 nrf_twi_task_trigger(twi, NRF_TWI_TASK_STARTTX);
<> 160:d5399cc887bb 687 if (stop) {
<> 160:d5399cc887bb 688 nrf_twi_task_trigger(twi, NRF_TWI_TASK_STOP);
<> 160:d5399cc887bb 689 } else {
<> 160:d5399cc887bb 690 nrf_twi_task_trigger(twi, NRF_TWI_TASK_SUSPEND);
<> 160:d5399cc887bb 691 nrf_twi_int_enable(twi, NRF_TWI_INT_SUSPENDED_MASK);
<> 160:d5399cc887bb 692 }
<> 160:d5399cc887bb 693 twi_info->events |= I2C_EVENT_TRANSFER_COMPLETE;
<> 144:ef7eb2e8f9f7 694 }
<> 160:d5399cc887bb 695
<> 160:d5399cc887bb 696 nrf_twi_int_enable(twi, NRF_TWI_INT_TXDSENT_MASK |
<> 160:d5399cc887bb 697 NRF_TWI_INT_RXDREADY_MASK |
<> 160:d5399cc887bb 698 NRF_TWI_INT_STOPPED_MASK |
<> 160:d5399cc887bb 699 NRF_TWI_INT_ERROR_MASK);
<> 144:ef7eb2e8f9f7 700 }
<> 144:ef7eb2e8f9f7 701
<> 144:ef7eb2e8f9f7 702 uint32_t i2c_irq_handler_asynch(i2c_t *obj)
<> 144:ef7eb2e8f9f7 703 {
<> 144:ef7eb2e8f9f7 704 twi_info_t *twi_info = TWI_INFO(obj);
<> 160:d5399cc887bb 705 return (twi_info->events & twi_info->evt_mask);
<> 144:ef7eb2e8f9f7 706 }
<> 144:ef7eb2e8f9f7 707
<> 144:ef7eb2e8f9f7 708 uint8_t i2c_active(i2c_t *obj)
<> 144:ef7eb2e8f9f7 709 {
<> 160:d5399cc887bb 710 twi_info_t *twi_info = TWI_INFO(obj);
<> 160:d5399cc887bb 711 return twi_info->active;
<> 144:ef7eb2e8f9f7 712 }
<> 144:ef7eb2e8f9f7 713
<> 144:ef7eb2e8f9f7 714 void i2c_abort_asynch(i2c_t *obj)
<> 144:ef7eb2e8f9f7 715 {
<> 144:ef7eb2e8f9f7 716 i2c_reset(obj);
<> 144:ef7eb2e8f9f7 717 }
<> 144:ef7eb2e8f9f7 718 #endif // DEVICE_I2C_ASYNCH
<> 144:ef7eb2e8f9f7 719
<> 144:ef7eb2e8f9f7 720 #endif // DEVICE_I2C